MCQOPTIONS
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MCQOPTIONS
This section includes 1154 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The calorific value of L.D. converter gas is about __________ Kcal/Nm . |
| A. | 1800 |
| B. | 800 |
| C. | 4500 |
| D. | 10000 |
| Answer» B. 800 | |
| 52. |
The calorific value of producer gas is around __________ kcal/Nm |
| A. | 1300 |
| B. | 500 |
| C. | 4500 |
| D. | 9000 |
| Answer» B. 500 | |
| 53. |
With increase in C/H ratio of a fuel, the amount of CO formed on its complete combustion |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | either (a) or (b), depends on other factors |
| Answer» B. decreases | |
| 54. |
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO, 20%CO and 10%O. The percent excess oxygen used is |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 55. |
Calorific value of wood gas is about __________ kcal/Nm. |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 56. |
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C. |
| A. | 70 |
| B. | 85 |
| C. | 105 |
| D. | 145 |
| Answer» D. 145 | |
| 57. |
Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about __________ °C. |
| A. | 30 |
| B. | 65 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 58. |
Heater plug are used to warm up _______ |
| A. | Fuel pump |
| B. | Feed pump |
| C. | Injector |
| D. | Combustion chamber |
| Answer» E. | |
| 59. |
Engine operating conditions may be indicated by the colour of exhaust smoke. Black smoke could indicate |
| A. | Insufficient speed droop setting |
| B. | Overloaded engine |
| C. | Clogged drain holes in the oil control rings |
| D. | Complete combustion |
| Answer» D. Complete combustion | |
| 60. |
Match List - I with List -II and select the correct answer using the code given below the listsList - I (SI Engine Operational Mode)A. IdlingB. CruisingC. Maximum PowerD. Cold startingList-II (A/F Ratio Supplied by the Carburetor)1. 32. 103. 134. 165. 20 |
| A. | A-2, B-4, C-5, D-1 |
| B. | A-4, B-5, C-3, D-2 |
| C. | A-2, B-4, C-3, D-1 |
| D. | A-4, B-5, C-3, D-1 |
| Answer» D. A-4, B-5, C-3, D-1 | |
| 61. |
Match List - I with List-II and select the correct answer using the given lists; (SI engine operational mode) (Approximate A/F ratio) A. Idling 1. 3 : 1 B. Cruising 2. 10 : 1 C. Cold starting 3. 13 : 1 D. Isothermal process 4. 20 : 1 |
| A. | A – 3, B – 4, C – 2, D – 1 |
| B. | A – 4, B – 1, C – 3, D – 2 |
| C. | A – 2, B – 4, C – 3, D – 1 |
| D. | A – 4, B – 2, C – 3, D – 1 |
| Answer» B. A – 4, B – 1, C – 3, D – 2 | |
| 62. |
Decrease of air-fuel ratio in spark ignition engines results in |
| A. | increase of NOx |
| B. | a decrease of CO and unburnt hydrocarbon |
| C. | an increase of CO and unburnt hydrocarbon |
| D. | none of the above |
| Answer» D. none of the above | |
| 63. |
In a normally operating diesel engine the main source of lubricating oil contamination in the crank case is a result of the |
| A. | Metal particles loosened by wear |
| B. | Condensation of water vapours |
| C. | Break down of the lubricating oil itself |
| D. | Fuel dilution |
| Answer» E. | |
| 64. |
Carbon monoxide formation in internal combustion engine is due to |
| A. | insufficiency of air |
| B. | insufficiency of oxygen |
| C. | insufficiency of air and temperature |
| D. | insufficiency of oxygen and temperature |
| Answer» B. insufficiency of oxygen | |
| 65. |
In an SI engine, the combustion: |
| A. | is by laminar flame propagation |
| B. | causes adiabatic flame temperature |
| C. | is turbulent flame propagation through a homogenous mixture of fuel and air |
| D. | is simultaneous combustion at many points in the combustion chamber |
| Answer» D. is simultaneous combustion at many points in the combustion chamber | |
| 66. |
Fossil fuels are used in |
| A. | Non-conventional energy production |
| B. | Conventional energy production |
| C. | Wind energy production |
| D. | Solar fuel cells |
| Answer» C. Wind energy production | |
| 67. |
Ash content of a diesel fuel oil should NOT exceed |
| A. | 1% |
| B. | 0.50% |
| C. | 0.10% |
| D. | 0.01% |
| Answer» E. | |
| 68. |
In loop scavenging, the top of piston is |
| A. | Contoured |
| B. | Depressed |
| C. | Slanted |
| D. | Flat |
| Answer» B. Depressed | |
| 69. |
In Spark ignition engine, fuel used is |
| A. | Diesel |
| B. | Petrol |
| C. | Kerosene |
| D. | Both Diesel and Kerosene |
| Answer» C. Kerosene | |
| 70. |
Common jet fuel is usually a refined form of |
| A. | Diesel |
| B. | Hydrazine |
| C. | Kerosene |
| D. | Alcohol |
| Answer» D. Alcohol | |
| 71. |
Consider the following:1. Increased cetane number2. Increased compression ratio3. Increased injection advance4. Increased air turbulenceWhich of the factors will reduce the physical delay in diesel engines? |
| A. | 1, 2 and 3 only |
| B. | 2 and 4 only |
| C. | 2, 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 72. |
Fuel ‘X’ has a calorific value of 50 kJ/g and produces carbon dioxide and water on combustion where as Fuel ‘Y’ has calorific value 35 kJ/g and produces oxides of sulphur and nitrogen on combustion. Which is a better fuel? |
| A. | Both fuels X and Y are equally bad |
| B. | Both fuels X and Y are equally good |
| C. | Fuel ‘X ‘is better than Fuel ‘Y’ |
| D. | Fuel ‘Y’ is better than Fuel ‘X’ |
| Answer» D. Fuel ‘Y’ is better than Fuel ‘X’ | |
| 73. |
For complete combustion of 1 kg of Carbon, the required Oxygen is |
| A. | 8 kg of oxygen |
| B. | 8/3 kg of oxygen |
| C. | 3/8 kg of oxygen |
| D. | None of the above |
| Answer» C. 3/8 kg of oxygen | |
| 74. |
If methane undergoes combustion with the stoichiometric quantity of air, the air-fuel ratio on molar basis would be : |
| A. | 15.22 : 1 |
| B. | 12.30 : 1 |
| C. | 14.56 : 1 |
| D. | 9.52 : 1 |
| Answer» E. | |
| 75. |
Carbon monoxide and Carbon dioxide emission can be measured using |
| A. | Infra – red method |
| B. | Chemiluminescent method |
| C. | Flame ionization method |
| D. | Ultra violet method |
| Answer» B. Chemiluminescent method | |
| 76. |
Losses caused due to leakage of combustion products past the cylinder onto the crank case are termed as: |
| A. | Flowby losses |
| B. | Followby losses |
| C. | Blowby losses |
| D. | Passby losses |
| Answer» D. Passby losses | |
| 77. |
Pre-ignition in an engine may be detected by |
| A. | increase in speed |
| B. | sudden loss of power |
| C. | typical sound |
| D. | exhaust coloration |
| Answer» C. typical sound | |
| 78. |
In a two-stroke Petrol engine, fuel loss is maximum after: |
| A. | Opening the exhaust port |
| B. | Closing the exhaust port |
| C. | Opening the inlet port |
| D. | Closing the inlet port |
| Answer» B. Closing the exhaust port | |
| 79. |
In Orsat apparatus, when the percentage of carbon dioxide, oxygen and carbon monoxide are known, the remaining gas is assumed to be |
| A. | Hydrogen |
| B. | Sulphur dioxide |
| C. | Nitrogen |
| D. | Air |
| Answer» D. Air | |
| 80. |
An indication of auto-ignition quality of a diesel fuel is given by |
| A. | octane number |
| B. | detonation |
| C. | preignition |
| D. | cetane number |
| Answer» E. | |
| 81. |
In practice, the pressure rise in an SI engine during combustion is lower than that in an air-standard Otto cycle for the same heat input because of |
| A. | variable specific heat and dissociation |
| B. | detonation in the farther regions from the spark plug |
| C. | leakage past the piston rings |
| D. | resistance to flow in the air filter |
| Answer» B. detonation in the farther regions from the spark plug | |
| 82. |
Consider the following statements:Combustion chamber is1. the volume between TDC and BDC during the combustion process2. the space enclosed between the upper part of the cylinder and the top of the piston during the combustion process3. the space enclosed between TDC and the top of the piston during the combustion processWhich of the above statements is/are CORRECT? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 3 only | |
| 83. |
Consider the following:1. Catalytic convertor2. Use of high compression ratio3. Oxidation catalyst in the exhaust manifold4. Use of high degree of superchargerBy which of these techniques, can the oxides of nitrogen in the exhaust be controlled? |
| A. | 1 only |
| B. | 2 and 4 only |
| C. | 2, 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» B. 2 and 4 only | |
| 84. |
Knocking tendency in a SI engine reduces with increasing |
| A. | Compression ratio |
| B. | Wall temperature |
| C. | Supercharging |
| D. | Engine speed |
| Answer» E. | |
| 85. |
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant? |
| A. | mmonium sulphate |
| B. | mmonium nitrate |
| C. | mmonium phosphate |
| D. | one of these |
| Answer» B. mmonium nitrate | |
| 86. |
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind? |
| A. | 0 |
| B. | 0 |
| C. | 5 |
| D. | 00 |
| Answer» E. | |
| 87. |
Which of the following coal gasification processes will produce gas having maximum methane content? |
| A. | inkler process |
| B. | urgi process |
| C. | opper-Totzek process |
| D. | ll of the above |
| Answer» C. opper-Totzek process | |
| 88. |
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal? |
| A. | itrain |
| B. | larain |
| C. | urain |
| D. | ussain |
| Answer» B. larain | |
| 89. |
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature? |
| A. | alorific value of the fuel |
| B. | lame temperature achieved |
| C. | peed of combustion of fuel |
| D. | eat transfer rate to the stock in the furnace |
| Answer» B. lame temperature achieved | |
| 90. |
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction? |
| A. | CO ⟷ C + CO₂ |
| B. | O + H₂O ⟷ CO₂ + H₂ |
| C. | + H₂O ⟷ CO + H₂ |
| D. | + 2H₂O ⟷ CO₂ + 2H₂ |
| Answer» B. O + H₂O ⟷ CO₂ + H₂ | |
| 91. |
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? |
| A. | sh disposal problem |
| B. | xcessive fly-ash discharge from the stack |
| C. | igh power consumption in its transportation |
| D. | rosion of induced draft fan blades |
| Answer» B. xcessive fly-ash discharge from the stack | |
| 92. |
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction.n. |
| A. | eumann reversal |
| B. | hift conversion |
| C. | oudouard |
| D. | eduction |
| Answer» D. eduction | |
| 93. |
In Orsat apparatus KOH is used to absorb |
| A. | CO2 |
| B. | CO |
| C. | O2 |
| D. | N2 |
| Answer» B. CO | |
| 94. |
A 1 g sample of fuel is burned in a bomb calorimeter containing 1.2 kg of water at an initial temperature of 25°C. After the reaction, the final temperature of the water is 33.2°C. The heat capacity of the calorimeter is 837 J/°C. The specific heat of water is 4.18 kJ/kg°C. The heat released by the fuel will be nearly |
| A. | 36 kJ/g |
| B. | 42 kJ/g |
| C. | 48 kJ/g |
| D. | 54 kJ/g |
| Answer» D. 54 kJ/g | |
| 95. |
If an IC engine consumes fuel at the rate of 1 g/s and if the air-fuel ratio for it is 20, the mass flow rate of exhaust gas in g/s is: |
| A. | 19 |
| B. | 21 |
| C. | 1 |
| D. | 20 |
| Answer» C. 1 | |
| 96. |
In four stroke diesel engine the power cycle is completed in the four strokes of the engine. In a diesel engine during suction stroke piston draws the ________ |
| A. | Gas |
| B. | Fuel Alone |
| C. | Pure air alone |
| D. | Mixture of air and fuel |
| Answer» D. Mixture of air and fuel | |
| 97. |
Consider the following statements for a combustion process:1. The total mass of each chemical element in the reactants is preserved in the products2. The presence of carbon monoxide in the products of combustion implies incomplete combustionWhich of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Neither 1 nor 2 |
| D. | Both 1 and 2 |
| Answer» E. | |
| 98. |
Most of the fossil fuels have: |
| A. | Degeneration |
| B. | Spontaneous combustion |
| C. | Explosion |
| D. | Rapid combustion |
| Answer» E. | |
| 99. |
For CI engines, fuels most preferred are |
| A. | Naphthalene |
| B. | Paraffins |
| C. | Olefins |
| D. | Aromatics |
| Answer» C. Olefins | |
| 100. |
Presence of moisture in fuel oil would |
| A. | keep the burner tips cool |
| B. | aid in proper combustion |
| C. | cause sputtering, possibly extinguishing flame |
| D. | clean the nozzles |
| Answer» D. clean the nozzles | |